To add an inline link for row duplication, on the index page.

### Add the Link

```
  index do
    .
    .
    actions defaults: true do |event|
      link_to 'Dup', clone_admin_conference_event_path(event.conference,event)
    end
  end
```

### Create the member action

- Clone the object
- Redirect to :new 
- For cascading clones of child objects, see the linked issue below.

```
  member_action :clone, method: :get do
    @event = resource.dup
    render :new, layout: false
  end
```

### Reference

- (https://github.com/activeadmin/activeadmin/issues/972)
